Mobile device indoor navigation
First Claim
1. A method of determining position of a mobile device, the method comprising:
- from a signal received at the mobile device, detecting at least a first signal encoded in an audio signal from a first audio source;
using the first signal to identify a neighboring audio source, different from the first audio source;
reconstructing a second signal associated with the neighboring audio source, wherein the reconstructing comprises obtaining a scrambling pattern associated with the neighboring audio source and applying the scrambling pattern to a message to reconstruct the second signal, and wherein the message is extracted from the from the first signal;
using the reconstructed second signal to detect a second signal transmitted in audio from the neighboring audio source; and
based on detecting of the first and second signals, determining position of the mobile device.
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Accused Products
Abstract
Mobile device positioning employs various forms of audio signal structures and detection methodologies. In one method, detection of an audio signal from a first source enables construction of a signal to facilitate detection of an audio signal from another source. Signals detected from these sources enable positioning of the mobile device receiving those signals. Another method forms audio signals transmitted from audio sources so that they have parts that add constructively and parts that differentiate the sources to enable positioning. Another audio signal based positioning method adaptively switches among positioning methods so that positioning remains operative as a mobile device moves toward and away from the sources. Another method tracks positioning history, evaluates it for errors and performs error mitigation to improve accuracy. Various other positioning technologies are detailed as well.
28 Citations
23 Claims
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1. A method of determining position of a mobile device, the method comprising:
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from a signal received at the mobile device, detecting at least a first signal encoded in an audio signal from a first audio source; using the first signal to identify a neighboring audio source, different from the first audio source; reconstructing a second signal associated with the neighboring audio source, wherein the reconstructing comprises obtaining a scrambling pattern associated with the neighboring audio source and applying the scrambling pattern to a message to reconstruct the second signal, and wherein the message is extracted from the from the first signal; using the reconstructed second signal to detect a second signal transmitted in audio from the neighboring audio source; and based on detecting of the first and second signals, determining position of the mobile device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification